The goal of the current work is to develop a method suitable for analyzing the horizontal phase speeds of atmospheric gravity waves from an extensive amount of gravity wave data obtained by the USU Advanced Mesospheric Temperature Mapper (AMTM) from Logan, Utah and South Pole, Antarctica. AMTM is a novel infrared digital imaging system that measures selected emission lines in the mesospheric OH (3,1) band to create intensity and temperature maps of the mesosphere. This analysis builds on the recent work by Matsuda et al. using all-sky (180° field-of-view) intensity data to investigate the gravity waves horizontal phase speed distribution. In our analyses we applied this technique to process spectra from temperature maps using instruments located on USU campus in Logan UT and at the South Pole Station. Their field-of-view is 120°. The ground-based remote sensing temperature measurements have been obtained using the nighttime hydroxyl (OH) emission, which originates at altitude about 87 km. The results are compared to intensity data and later to conventional event analysis in which the phase fronts are traced manually.